Violation of reparative regeneration of bone tissue in treatment of open fractures is an urgent problem [1,2]. The frequency of unsatisfactory results of the treatment of these fractures remains high (30%) [3]. The main factors of bone regeneration disorders in conditions of open fractures are following: damage to soft tissue, soft tissue tropism violation, violation of bone trophic and infecti...

Ultrasound-modulated optical tomography based on the measurement of laser-speckle contrast was investigated. An ultrasonic beam was focused into a biological-tissue sample to modulate the laser light passing through the ultrasonic column inside the tissue. The contrast of the speckle pattern formed by the transmitted light was found to depend on the ultrasonic modulation and could be used for i...

In the field of ultrasonic diagnosis, its attenuation property in the brain has been also explored. Investigated are the ultrasonic attenuation of the brain following experimental head injury as well as cerebral circulation and water content of brain, the purpose of which are to analyse the essential mechanism of ultrasonic attenuation as its relationship to the brain edema. I studied the conti...

The ultrasonic attenuation is evaluated at 300 K along [100], [110], and [111] directions for the characterization of bcc metal Ta. The size of the metal is considered in nanorange. Ultrasonic velocity, Grüneisen parameter and acoustic coupling constant that depend on second and third order elastic constants are calculated for determination of ultrasonic attenuation coefficient. Second and thir...

Measurement of the acoustic power in high-energy ultrasonic devices is complex due to occurrence of the strong cavitation in front of the sonotrode tip. In our research we used three methods for characterization of our new ultrasonic probe for neuroendoscopic procedures. The first method is based on the electromechanical characterization of the device measuring the displacement of the sonotrode...

BACKGROUND To establish the correlation between quantitative analysis based on B-mode ultrasound images of vulnerable carotid plaque and histological examination of the surgically removed plaque, on the basis of a videodensitometric digital texture characterization. METHODS Twenty-five patients (18 males, mean age 67 +/- 6.9 years) admitted for carotid endarterectomy for extracranial high-gra...

Quantitative ultrasonic characterization of cancellous bone can be complicated by artifacts introduced by analyzing acquired data consisting of two propagating waves (a fast wave and a slow wave) as if only one wave were present. Recovering the ultrasonic properties of overlapping fast and slow waves could therefore lead to enhancement of bone quality assessment. The current study uses Bayesian...

Metal structures can fail because of fatigue crack propagation or because of section loss from corrosion. Regular inspection is required to detect such failures. We report here progress toward the development of MEMS-based transducers for ultrasonic flaw detection, to be permanently mounted at critical locations on structures. In a complete system, a single piezoelectric element will be used to...

This thesis focuses on the possibility of using ultrasonic measurement techniques for energy gas characterization. The idea is to combine both on-line flow measurements with non-invasive fluid characterization in the same measurement setup using the same sensor(s). The long-term goal of the project is to develop measurement methods based on ultrasonic techniques that can measure; the flow rate,...